I've sorted the following voice files I found in the ROM Filesystem of Brain Age for the 3DS.
It took me some time to extract it, so here you go!

Tools used:
- 3dstool: Extracting and the main way I used to manipulate the files to extract them fully.
- CIA Decryptor: Thanks to the tool I used, that helped decrypt the title CIA of the game, enabling me to use the CCI file in 3dstool

Hope you enjoy this stellar contribution~
Hoshino Luna

PS: This is the US version of the game in English. It's the only one I extracted, so please keep that in mind. Requests can be commeneted on the publication. Also I noticed some lines are in Japanese that escaped my filters so I got rid of them too while filtering these out. Some may be labeled on English, so do let me know which ones are in there and I can request a file update promptly.